Pump jack



May 17, 1927. y v 1,628,692 v E. R. THOMAS ET AL.

May 17, 1927.

E. R. THOMAS ET AL PUMP JACK .Filed NOV., 17. 1925 2 ShBevtS-Sheec 2Patented May 17, 1927.

UNITED STATES PATENT oEFlcE.

ELMER R. THQMAS AND PEARLEY E. LANGFITT, OF SHIDLER, OKLAHOMA.

PUMP

Jaen.

Our present invention pertains to pump jacks, and is designed moreparticularly as a practical improvement upon the pump jack constitutingthe subject of our Letters-Patent No. 1,553,486, and dated September 15,1925.` i

The general` object of our said invention is the provision of a pumpjack of simple, inexpensive and strong construction and onesusceptibleof ready adjustment for the pui"- pose of preventing breakagein the event of a `1nishap`,fan `ij` also susceptible of convenient`adjustment in order to assure the shine operatingtunder all conditionsto the best advanta e. l

ther objects nd practical advantages of the"invention atvill befi'ullyunderstood fronrthe following description and claims when the samefareread in connection with the drawings, accompanying and forming partofthis specification, in which Fignre 1 is al side elevation of the besteX- em lication of our present invention ot' which we are aware.

Figure 2 is a vertical transverse section taken in the plane indicated`by thetline 2%-2 oi' Figure 1. Figure `is`a horizontal section taken inthe plane indicated" by the line 3-3 of Fiurel." m "i igure 4 is afragmentary end elevation illustrating the means employed for etlectingconnection between the polish rod and thewalking"beam.` i

Similar numerals of reference designate corresponding `in all of theviews of the drawings". The walking beam of our improved jack isdesignatedby Land is" fulcrumed at 2 betweentwo spaced uprights 3 whichare lixed to sills lon a base`5, and are braced by bars 6. Thewalkingbeam 1 is formed by two spacedbars' and' between the een trai pbrtionsofthe bars G is fixed a body Y member 7, integral with which is a pendentportion 8 which receives the fulcrum pintle and which rests under thelower edges ol the bars 'soas to strongly support the said bars on thefulcrum pintle. The upper ortion the body 7 is flanged at 8 to ear onthe upper edges of the bars 6, and rising from the flanges 8 an integraltherewith are wel t) disposed ati-.ight a-rlglesto'each other`,`t"e saidWebs 9 bem provided with a seat 10 in the upper en" s thereof for va`the Hat face 25 of the head 12.

truss rod 11, which is connected at one end o the head l2 between endportions olf the bars G as designated by 13. The portion ot the trussrod 11 at the opposite side of the" body portion 9, with reference tothe connection 13 is threaded as designated by lll for the engagement ofa turnbuckle 15 which is appropriately threaded to engage the thread ofanother rod section 1G, the rod 1G extending to a block 17 between end`portions of the bars (i andl being threaded for the engagement oi a nut18 at the outer end ot' the said block. Manifestly when conw sti-notedin the manner described, the walking beam will be capable ofwithstanding great shocks and strains, and whenever occasion demands thewalking beam may be adjusted to compensate for sagging of either endthereoit' by simply turning the turn buckle 15.

The head 12 is Vinterposed between end portions of the walking beam bars6 and is provided with flanges 20 above and below thebars 6,wherebypractically allstrain is taken oil the transverse connectingbolts 21. :The upper outer portion of the head 12 is in the form of anapertured lug 22, and to said lug 22 is pivotally `connected at 3,3 thebifurcated upper end of a pendent an 24 being adapted to normally restagainst The member 24: is"characterized'` by a lower biturcated hookport-ion, said portion being numbered 26, and its bifurcation beingadapted toV accommodate or receive a polish rod 27. The

`saidpolish rod 27 is provided with lateral projections 28 fixedthereto, and the said lateral projections 28 are adapted to seat in thehook 26 at opposite sides of the bifurcation thereof, whereby a strongconnection may be effected between the polish rod 27 and the member 24.The said lateral projections of tbepolish rod 27 are of circular form incross section, and the inner side oit thebill of the hook 2G is(,'orrespomliugly rounded so as to permit lrec movement of thehook`26`a1bout the said lateral projections 28%. Manifest-.ly thisprovision avert-s binding during the vertical oscillation ot the walkinbeam 1, the member 24`b`eing adaptv ed `inci entto up and down movementsof the walking beam to swing relative tot-.lie face otthe head12 sothatat no time will any lateral pull or strainbe imposed on the swingablemember 24, the said member .fr

the Walking beam, and pitmen disposed at opposite sides of the Walkingbeam and truss frame and also at opposite sides of said members andpivotally connected with said members.

4. In a pump jack, a Walking beam, a support therefor, a truss frame,swingable means adapted when positioned in substantially uprightposition below the Walking l0 beam to prevent downward movement of onearm thereof, adjustable means on the support for maintaining said memberin said substantially upright position, and adjusta ble means on thesupport adapted to be detaeliably connected With the truss frame toanchor the same to the support.

In testimony whereof we affix our signatures.

ELMER R. THOMAS. PEARLEY E. LANGFITT.

